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.Management Sciences
Category: Materials and Construction
In the Kraft (sulphate) process for the paper manufacture, the digestor is made of________________?
A. Cast iron
B. Stainless steel
C. Karbate carbon
D. Wrought iron
With increase in carbide/graphite ratio in cast iron, its__________________?
A. Hardness & brittleness increases
B. Ductility decreases
C. Both A. and B.
D. Neither A. nor B.
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its ______________________?
A. High co-efficient of thermal expansion
B. Low thermal conductivity
C. High corrosion resistance
D. All A., B. and C.
Cementite is________________?
A. Fe3C chemically
B. A compound of carbon and iron
C. Characterised by an orthorhombic crystal structure
D. All A., B. and C.
Urea autoclave is made of_________________?
A. Cast iron
B. Refractory blocks
C. Stainless steel
D. Lead lined steel
Nickel made/clad equipments are suitable for handling________________?
A. Ammonia (both aqueous & anhydrous)
B. Fruit juices, milk & its products and caustic soda solution
C. Nitric acid & hydrochloric acid (concentrated)
D. Sulphuric acid (concentrated)
Aqueous nitric acid is stored in ______________ vessel?
A. Plain carbon steel
B. Stainless steel
C. Cast iron
D. Thermosetting plastic material
The process of coating steel sheets by zinc to improve its corrosion resistance is called___________________?
A. Calorising
B. Galvanising
C. Zincification
D. Tempering
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of___________________?
A. Rubber lined mild steel
B. Lead lined mild steel
C. Aluminium
D. Cast iron
Fatigue failure of a material results from _____________ stress?
A. Tensile
B. Compressive
C. Fluctuating
D. None of these
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